如何使嵌入式Explorer IShellView可浏览(即触发BrowseObject事件)

Question

我在我的Win32应用程序中"嵌入Windows资源管理器".(从技术上讲,我在我的应用程序中托管了一个文件夹的ShellView,这是Windows资源管理器所做的).

问题是视图永远不会调用IShellBrowser.BrowseObject.shell视图不是要求我导航到新位置(通过BrowseObject事件),而是启动Windows资源管理器的副本以查看该文件夹.

我希望默认的shell视图(通俗地称为DefView)是可浏览的.

---

示例代码教程

首先,我们需要获取IShellFolder我想要显示的文件夹.要获取的最简单的文件夹是Desktop文件夹,因为SHGetDesktopFolder API它有一个for:

folder: IShellFolder;

SHGetDesktopFolder({out} folder);

接下来我们要求桌面文件夹将其IShellView 交给我们:

view: IShellView;

folder.CreateViewObject(Self.Handle, IID_IShellView, {out}view);

现在我们有文件夹的IShellView(而不是IContextMenu或IExtractIcon),我们现在想通过调用IShellView.CreateViewWindow来显示shell视图:

hostRect: TRect; //where the view is to display itself
folderSettings: TFolderSettings; //display settings for the view
hwndView: HWND; //the newly created view's window handle

folderSettings.ViewMode := FVM_DETAILS; //details mode please, rather than icon/list/etc
folderSettings.fFlags := 0;
hostRect := Rect(20, 20, 660, 500); //the view can position itself there

view.CreateViewWindow(nil, folderSettings, shellBrowser, {var}hostRect, {out}hView);
view.UIActivate(SVUIA_ACTIVATE_NOFOCUS);

et voila,可识别的shell listview,显示我的桌面:

完成上下文菜单处理程序:

除非我点击Open,而不是BrowseObject通过IShellBrowser我提供的界面向我发送事件,它会打开一个新窗口:

双击时也会发生同样的情况.

我怎样才能让微软的DefView可以浏览？

---

更新 ShellBrowser实现

创建时,IShellView必须为其提供实现的对象IShellBrowser.该ShellBrowser对象是视图如何与主机容器通信.

在15种方法中,我只仔细看四 - 其余的可以返回E_NOTIMPL(当然可能是问题):

{IShellBrowser}

• BrowseObject(PCUIDLIST_RELATIVE pidl, UINT wFlags);

  //Informs Windows Explorer to browse to another folder.
  //This is the notification i want!
  Result := BrowseToAnotherFolder(pidl, wFlags);
  

• GetControlWindow(UINT id, HWND *lphwnd);

  //Gets the window handle to a browser control.
  //Since i don't have a toolbar, tree, status or progress windows, return 0
  lphwnd := 0;
  Result := S_OK;
  

• SendControlMsg(UINT id, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT *pret);

  //Sends control messages to either the toolbar or the status bar in a Windows 
  //From MSDN: Notes to Implementers
  //    If your Windows Explorer does not have these controls, you can return E_NOTIMPL.
  Result := E_NOTIMPL;
  

• GetViewStateStream(DWORD grfMode, IStream **ppStrm);

  //Gets an IStream interface that can be used for storage of view-specific state information.
  Result := E_NOTIMPL; //i'm don't have a stream to give you
  

• TranslateAcceleratorSB(LPMSG lpmsg, WORD wID);

  //Translates accelerator keystrokes intended for the browser's frame 
  //    while the view is active.
  Result := E_NOTIMPL; //i won't be doing any translating
  

• OnViewWindowActive(IShellView *ppshv);

  //Called by the Shell view when the view window or one of its child 
  //    windows gets the focus or becomes active.
  Result := S_OK; //i got the notification, thanks
  

• QueryActiveShellView(IShellView **ppshv);

  //Retrieves the currently active (displayed) Shell view object.
  ppshv := view;
  Result := S_OK; //i would never view another, you know that
  

• EnableModelessSB(BOOL fEnable);

  //Tells Windows Explorer to enable or disable its modeless dialog boxes.
  Result := S_OK; //You want to enable modeless dialog boxes? Interesting.
  

• InsertMenusSB(HMENU hmenuShared, LPOLEMENUGROUPWIDTHS lpMenuWidths);

  //Allows the container to insert its menu groups into the composite
  //  menu that is displayed when an extended namespace is being viewed or used.
  Result := E_NOTIMPL; //i no has menus
  

• RemoveMenusSB(HMENU hmenuShared);

  //Permits the container to remove any of its menu elements 
  //   from the in-place composite menu and to free all associated resources.
  Result := E_NOTIMPL; //i no has menus
  

• SetMenuSB(HMENU hmenuShared, HOLEMENU holemenuRes, HWND hwndActiveObject);

  //Installs the composite menu in the view window.
  Result := E_NOTIMPL; //i no has menus
  

• SetStatusTextSB

  //Sets and displays status text about the in-place object 
  //in the container's frame-window status bar.
  Result := E_NOTIMPL; //i no has status bar
  

• SetToolbarItems(LPTBBUTTONSB lpButtons, UINT nButtons, UINT uFlags);

  //Adds toolbar items to Windows Explorer's toolbar.
  Result := E_NOTIMPL; //i no has toolbar
  

那就是祖先IOleWindow:

• GetWindow([out] HWND *phwnd);

  //Retrieves a handle to one of the windows participating in 
  //   in-place activation (frame, document, parent, or in-place object window).
  phwnd := Self.Handle; //here's the handle, again, of your parent
  Result := S_OK; 
  

• `ContextSensitiveHelp([in] BOOL fEnterMode);

  //Determines whether context-sensitive help mode should be entered 
  //during an in-place activation session.
  
  Result := S_OK; //Ok, thanks, i'll make a note of it
  

的IServiceProvider

function TShellBrowser.QueryService(const rsid, iid: TGuid; out Obj): HResult;
var
    sb: IShellBrowser;
    s: string;
const
    SID_SInPlaceBrowser: TGUID = '{1D2AE02B-3655-46CC-B63A-285988153BCA}';
    SID_IShellBrowser: TGUID = '{000214E2-0000-0000-C000-000000000046}';
begin
    {
        This code is executed when you double click a folder.
        It's needed to implement inline browsing.
        If you double click a folder the default action of IShellBrowser is to open a new Windows Explorer.
        To open the folder in the current window you must implement IServiceProvider.

        http://blogs.msdn.com/b/ieinternals/archive/2009/12/30/windows-7-web-browser-control-will-not-browse-file-system.aspx
    }
    Result := E_NOINTERFACE; //Return $E_NOINTERFACE

    OutputDebugString(PChar('TShellBrowser.QueryService: '+IIDToString(rsid)));
    {
        Make a small change to your application to enable the filesystem object to navigate in-place within the WebOC
        when running on Windows 7.
        To do so, your hosting application will implement the IServiceProvider interface,
        and hand back the WebBrowser control’s SID_SShellBrowser when asked for SID_SInPlaceBrowser
    }
    if IsEqualGUID(rsid, SID_SInPlaceBrowser) then
    begin
        sb := Self as IShellBrowser;
        Pointer(Obj) := Pointer(sb);
        sb._AddRef;
        Result := S_OK;
    end;
end;

奖金阅读

• 前MSFT Eric Law将此行为记录为Windows 7中的一个实时更改,以及如何解决它.(除非它不起作用)
• fogbit有同样的问题
• 更多关于如何实现IServiceProvider以响应SID_SInPlaceBrowser的讨论

---

也可以看看

• 实现IShellBrowser来托管IShellView

Answer 1

在 Vista 或更高版本上，您可以切换到托管 ExplorerBrowser，从中您可以 QI IObjectWithSite 并传递一个使用 SID_SShellBrowser 或 SID_SInPlaceBrowser 等服务实现 IServiceProvier 的对象。

在 XP 上，您可能需要处理源自您的进程的 DDE 消息，因为当时默认的文件夹关联是 DDE。